Stainless Steel Pipe Ferritic is generally nickel-free. The main alloying element is chromium. This steel contains relatively low carbon and often contains ferrite forming elements such as aluminum to ensure that the steel is mainly ferrite. The chromium content is generally between 12% and 30%, and the carbon content is mostly less than 0.12%. Ferritic stainless steel is roughly divided into Cr11%-15%, Cr16%-20% and Cr21-30% according to the chromium content in the steel. In addition to stainless steel and local corrosion resistance, ferritic stainless steel is resistant to chloride. Stress corrosion, pitting corrosion resistance, crevice corrosion resistance and other local corrosion performance are the main features of corrosion resistance of such steel. Ferritic stainless steel has high strength and low cold work hardening tendency. Its thermal conductivity is 130%-150% of austenitic stainless steel, and the coefficient of linear expansion is 60% to 70% of austenitic stainless steel. However, in the 90 years since the advent of this steel, compared with austenite, the use of steel has been extremely limited and the output has been low. The main disadvantages are room temperature, poor low-temperature toughness, high notch sensitivity, and sensitivity to crystalline corrosion. These shortcomings increase with the cross-sectional dimension, the cooling rate becomes slower, and the welding heat effect is more strongly shown.
Stainless Steel Pipe Ferritic
The ferritic stainless steel and Austenitic Stainless Steel Pipe are analyzed from four parameters: modulus of elasticity, thermal conductivity, coefficient of linear expansion, and density:
Elastic modulus: High-performance ferritic stainless steel is slightly larger than high-performance austenitic stainless steel, so the seismic performance of high-performance ferritic stainless steel is slightly stronger than that of high-performance austenitic stainless steel, and thinner walls can be used instead of Vibrating, thin walls are also more conducive to heat transfer.
Thermal conductivity: High-performance ferritic stainless steel is larger than high-performance austenitic stainless steel, so high-performance ferritic stainless steel has better heat transfer performance than high-performance austenitic stainless steel.
Linear expansion coefficient: High-performance ferritic stainless steel is closer to the linear expansion coefficient of carbon steel than high-performance austenitic stainless steel. Therefore, the high-performance ferritic stainless steel has less internal stress caused by thermal expansion, and the surface oxide film differs due to the thermal expansion coefficient. The tendency of flaking or cracking is small, and it is more suitable for the environment of high-temperature cyclic oxidation.
Density: High-performance ferritic stainless steel is smaller than high-performance austenitic stainless steel. Under the same volume, high-performance ferritic stainless steel is lighter than high-performance austenitic stainless steel.
These two types of high-performance stainless steel welded pipes have excellent corrosion resistance for various types of corrosion such as chlorine pitting, steam erosion, stress corrosion, and marine bio-corrosion. Therefore, both types of high-performance stainless steel welded pipes can be applied (including contaminated seawater).
At the same time, ferritic stainless steel has high thermal conductivity, about 135% of chrome-nickel austenitic stainless steel, which is very suitable for heat exchange applications; its thermal expansion coefficient is small, only about 60% of chrome-nickel austenitic stainless steel, very It is suitable for use in conditions of thermal expansion and contraction and thermal cycling, such as water-based evaporators and heat exchanger tubes and separators for heat exchangers. Magnetic, can be used as corrosion-resistant soft magnetic materials, such as solenoid valves, electromagnetic cookers, etc.
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